Vlad and Jenne,
From the summary pages, as of 0200 UTC 20191204, the 3rd bandpass region of the sqeezing has beern reporting increasingly degrading squeezing starting at near -2dB, to sitting at above +2dB currently.
Jenne nagivated the the sitemap to find that this band corresponds to the region between 500-900 Hz, and suggested I run a BruCo before this happened, as well as more recently to help find an issue, to hopefully spot a noise contributor to DARM in that band.
I am currently running a BruCo - and should be able to inspect the data tomorrow.
In the attachments you can see the relevant plot of this band creeping up over the last two days. (its the green one)
Completed Bruo:
I shall guide your eyes to the frequencies 838 and 839.
Here you will see many channels correlating somewhat strongly in the After that were not present in the Before.
Importantly things like:
PEM-CS_MAG_LVEA_VERTEX_X_DQ, PEM-CS_MAG_LVEA_VERTEX_Y_DQ,PEM-CS_MAG_LVEA_VERTEX_QUAD_SUM_DQ
suggest something new in the magnetic spectrum
PEM-CS_RADIO_ROOF4_BROADBAND_DQ, PEM-CS_RADIO_ROOF3_BROADBAND_DQ
also suggest something electronic - visible on the LVEA roof? need to be sure whether it is internal or external
LSC-MOD_RF9_AM_ERR_OUT_DQ, LSC-MOD_RF45_AM_ERR_OUT_DQ
suggests that this is affecting the sideband generation before it is applied to the EOM in the PSL
LSC-MOD_RF45_AM_CTRL_OUT_DQ, LSC-MOD_RF9_AM_AC_OUT_DQ
suggests that the cavity control sidebands are affected
Many channels like :PEM-CS_ADC_5_30_2K_OUT_DQ
Visible in many electronics monitors
ASC-AS_B_RF72_Q_SUM_OUT_DQ, ASC-AS_A_RF72_Q_SUM_OUT_DQ, ASC-AS_B_RF72_I_SUM_OUT_DQ, ASC-AS_A_RF45_I_SUM_OUT_DQ, ASC-REFL_A_RF45_Q_YAW_OUT_DQ, ASC-AS_B_RF36_I_PIT_OUT_DQ, ASC-AS_B_RF36_Q_YAW_OUT_DQ,
That the noise propagates through to the various wavefront sensors
I am currently trying to use Lasso to see how one of the more interesting channels has evolved in that band:H1:PEM-CS_RADIO_ROOF4_BROADBAND_DQ
As of 0300 UTC 20191213, This noise has stopped and Sqeezing seems to be reported fine.